Snells Law
The reflection and transmission response of light crossing a boundary depends on both the indices at the boundary and the angle of incidence to the boundary plane. The angle of incidence θi from a medium of index ni is directly related to the transmission angle θt into a medium of index nt, with angles from the plane normal.
![Snells Law](/sites/default/files/styles/viewport/public/2020-07/6367.jpg.webp?itok=8f0RNHjR)
Related Terms: Fresnel Reflection, Refractive Index, Total Internal Reflection (TIR)